John Bolton

U.S. Sen. Rand Paul celebrated President Donald Trump’s firing of national security adviser John Bolton on Tuesday, saying that the “chances of war go down greatly” with Bolton leaving the White House.

The State Department has opened up a transition office, but that ground-floor corner office in Washington's Foggy Bottom neighborhood is quiet for now as diplomats await news of their new boss. Donald Trump's pick for secretary of state could tell a lot about the direction he will take U.S. foreign policy.

At the moment, all eyes are on former New York Mayor Rudy Giuliani, a longtime friend of Trump and strong backer throughout the campaign. He's an unlikely candidate with little foreign policy experience, though he did manage the city that is home to the United Nations.